Envelope inserter machine



FIG. 1 is a top perspective view of an envelope inserter machine showing my new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a right side elevational view thereof. 

The ornamental design for an envelope inserter machine, as shown and described. 